Steam-hammer throttle-gear.



W. J. HAGMAN.

STEAM HAMMER THROTTLE GEAR.

APPLICATION FILED SEPT.2, 1911.

Patented Aug. 6, 1912.

llJz' z 71 eases 17!! orne y UNITED STATES PATENT OFFICE.

WILLIAM J. HAG-MAN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO NILES- IBEMENT-ZPOND COMPANY, OF JERSEY CITY, NEW EIERSEY.

STEAM-HAMMER TH'RGITIzE-GEAR.

Specification of Letters Patent.

Application filed September 2, ran.

Serial No. 667,427.

To all whom it maylconce/m:

Be it known that I, Wa-LmAM. J. HAGMAN, a citizen of the United :States, residing at Philadelphia, Philadelphia county, Pennsylvania, have invented certain new and useful Improvements .in Steam-Hammer Throttle-.Gears, of which the following is a specification.

In most steam hammers the throttle valve is urged to closed position by a spring and is opened by the movementof a treadle and it is usual to so adjust the length of the connection between the treadle and valve that the valve will be a trifle open when the hamaner is at rest and the treadle is up, the ob ject of this being to .keep the hammer warmed up while waiting on a heat. Too liberal a throttle opening under these conditions results in undesirable waste of steam. In case of quick heats no Warming steam need be left upon the hammer and in case of long heats the steam should be suflicient to make up for leakage and condensation in keeping the hammer warm. Furthermore, in starting up a hammer from cold condition the throttle may require re-adjustment as the hammer has worked awhile, in order to secure the desired warming conditions without undue waste of steam. In. most steam hammers the connecting rod or chain between the treadle and the throttle is provided with facilities, a turn-buckle or the like, by means of which such adjustments may be made, but they are inconvenient and slow. The treadle has an upward limit of motion, as determined by a fixed stop, this position representing such position of the valve as corresponds with the desired degree of trifling opening.

My present invention provides for a convenient and quick adjustment of the osition of the treadle so that the throttle-Va ve may be completely closed or left open to desired degree.

My invention will be readily understood from the following description taken in connection with the accompanying drawing which is a side elevation of a throttle valve gear exemplifying my invention.

In the drawing:1, indicates any ordinary throttle valve, suitable for steam hammer purposes: 2, the valve-lever closing the valve by upward motion: 3, a spring cooperating with the valve-lever and urgin it upward to close the valve: 4, the usua treadle :by means of which the throttle is opened or permitted to close: 5, the fixed pivot of the treadle '6, the :usual connection, rod or chain, between the treadle and the throttle-lever: 7, a cam mounted on a fixed pivot and adapted to engage the top of .the treadle and limit, in adjustable degree, the upward movement of the treadle: 8, a notched so ment to serve in retaining the cazm in ad usted osition: and 9, a handlever connected with the cam and carrying detent mechanism to coiiperate with the matched segment.

The cam 7 takes "the :place of the usual fixed stop for limiting the upward movemmt of the treadle.

Assume that with the parts in the position indicated in the drawing the throttle is open to the maximum extent required in keeping vsullicient steam on the hammer while it is idle, the cam thus performing :the usual oflice of the fixed stop. If the conditions should chan e so that no steam for the present was needed on the hammer then the cam would .be turned up and the treadle would rise and completely close the throttle. The adjustment of the cam permits of the ready adjustment of the degree of throttle-opening between the two extremes mentioned, namely, that of maximum warming opening and that of complete closure.

In the exemplification illustrated the treadle is a treadle in fact, that is to say, worked by foot, and the hand-lever is a hand-lever in fact, but it may well be in some cases the treadle itself becomes a handlever, and the cam-lever might also become a foot-lever. We may therefore look upon the treadle as a throttle-operating lever, regardless of whether it be worked by hand or foot, and we may look upon the camlever as a throttle-limiting lever regardless of whether it be worked by hand or by foot, and it is also to be observed that the cam- .lever may be manipulated to bring about a complete closure of the valve or a limited Patented Aug. 6,1912.

dpening of the valve without employing the foot directly upon the treadle.

It is to be observed that the adjustable stop formed by cam 7 does not lock the footlever against normal action but simply limits the degree of closure of the throttle valve. In other words, regardless of whet-her cam 7 has been adjusted to ermit the throttle to completely close, or a justed to prevent the throttle from entirely closing, foot-lever 4 is always free for depression for the purpose of opening the throttle to permit the hammer to gointo its regular work. No locking system applied to the foot-lever 4 or to the throttle to .hold the throttle in some adjusted position, and requiring to be unlocked before the throttle could be given its usual opening motion would answer the purpose of stop 7 which acts upon the throttle as an abutment to limit the closing motion of the throttle while leaving it free to be opened.

I claim 1. A steam hammer throttle gear com prising, a throttle valve, yielding means urging the valve to closed position, an adjustable stop cooperating with the throttle valve to serve in limiting its degree of closure without interfering with its capacity for being opened, and a valve operating lever having connection with the throttle valve and adapted to serve in opening it, combined substantially as set forth.

2. A steam hammer throttle gear comprising, a throttle valve, yielding means urging the valve to closed position, a valveoperating lever having connection with the valve and adapted to serve in opening it, and a stop cooperating with the valve-operating lever to prevent the complete closure of the valve without interfering with the motion of the lever in opening the valve, combined substantially as set forth.

3. A steam hammer throttle gear com prising, a throttle valve, yielding means urging the valve to closed position, a valve-operating lever having connection with the valve and adapted to serve in opening it, a stop cooperating with the valve-operating lever to prevent the complete closure of the valve without interfering with the motion of the lever in opening the valve, and means for adjusting said stop, combined substantially as set forth.

4. A steam hammer throttle gear comprising, a throttle valve, yielding means urgin the throttle valve to closed position, a valveoperating lever having connection with the valve and adapted to serve in opening it, a pivoted cam adapted to move the valve-operating lever in valve-opening direction and to limit its movement in the valve-closing direction without interfering with its movement in the valve-opening direction, means for turning said cam, and. a

locking device to secure the cam in adjusted position, combined substantially as set forth.

\VILLIAM J HAGMAN.

Witnesses:

E. H. WRAY, GEO. G. RAYMOND. 

